Physics – Condensed Matter – Superconductivity
Scientific paper
2010-08-12
Phys. Rev. Lett. 106, 117001 (2011)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.106.117001
We have studied the three-dimensional shapes of the Fermi surfaces (FSs) of BaFe2(As1-xPx)2 (x=0.38), where superconductivity is induced by isovalent P substitution, by angle-resolved photoemission spectroscopy. Moderately strong electron mass enhancement has been identified for both the electron and hole FSs. Among two observed hole FSs, the nearly two-dimensional one shows good nesting with the outer two-dimensional electron FS, but its orbital character is different from the outer electron FS. The three-dimensional hole FS shows poor nesting with the electron FSs. The present results suggest that the three-dimensionality and the difference in the orbital character weaken FS nesting, leaving partial nesting among the outer electron FSs of dxy character and/or that within the three-dimensional hole FS, which may lead to the nodal superconductivity.
Arita Ryotaro
Fujimori Atsushi
Ideta S.
Ikeda Hiroaki
Kasahara Satoshi
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